CN107272163B - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN107272163B CN107272163B CN201710191271.3A CN201710191271A CN107272163B CN 107272163 B CN107272163 B CN 107272163B CN 201710191271 A CN201710191271 A CN 201710191271A CN 107272163 B CN107272163 B CN 107272163B
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- 230000005499 meniscus Effects 0.000 claims abstract description 37
- 239000004033 plastic Substances 0.000 claims abstract description 19
- 230000004075 alteration Effects 0.000 abstract description 57
- 238000000034 method Methods 0.000 abstract description 21
- 230000008569 process Effects 0.000 abstract description 21
- 230000014509 gene expression Effects 0.000 description 56
- 238000010586 diagram Methods 0.000 description 24
- 230000003287 optical effect Effects 0.000 description 17
- 201000009310 astigmatism Diseases 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
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Abstract
The invention provides a wide-angle lens which can reduce aberration without increasing the burden of the process. In a four-group five-lens wide-angle lens (100), a fourth lens (14) is a negative meniscus lens having a concave surface facing the image side, or a biconcave lens, and a fifth lens (15) is a biconvex lens. The fourth lens (14) and the fifth lens (15) are plastic lenses and constitute a cemented lens (16). The refractive index n4 of the fourth lens (14) exceeds 1.6, and when the center radius of curvature of the joint surface of the joint lens (16) is R45 and the effective focal length of the entire lens system is f0, the center radius of curvature R45 and the effective focal length f0 satisfy 0.5 < | R45/f0| < 0.8.
Description
Technical Field
The invention relates to a wide-angle lens with a four-group (four groups) and five-piece (five lens) structure.
Background
As a photographing lens, a four-group five-lens wide-angle lens has been proposed, which includes: a first lens, a second lens, a third lens, a stop, a fourth lens, and a fifth lens, which are arranged in this order from the object side to the image side, are configured as cemented lenses (see patent document 1). The wide-angle lens described in patent document 1 adopts the following configuration: the fourth lens and the fifth lens are combined lenses in which a lens surface on the image side including a concave curved surface of the fourth lens and a lens surface on the object side including a convex curved surface of the fifth lens are combined, and chromatic aberration of magnification (magnification) and the like are reduced.
Documents of the prior art
Patent document
Disclosure of Invention
Problems to be solved by the invention
In the wide-angle lens described in patent document 1, the effective focal length of the entire lens system is 1mm, and the center curvature radius of the joint surface (ninth surface) of the joint lens is 0.4327 mm. Therefore, the curvature of the image side lens surface including the concave curved surface of the fourth lens and the curvature of the object side lens surface including the convex curved surface of the fifth lens are large, and therefore, there is a problem that a burden on the process is large, and it is difficult to stably perform the manufacturing process and the bonding process of the lens elements, for example.
In view of the above problems, an object of the present invention is to provide a wide-angle lens capable of reducing aberrations without increasing the burden on the process.
Means for solving the problems
In order to solve the above problem, a wide-angle lens according to the present invention includes: a first lens, a second lens, a third lens, a diaphragm, a fourth lens and a fifth lens, which are arranged in order from an object side to an image side, wherein the first lens is a negative meniscus lens (negative meniscus lens) having a convex surface facing the object side, the second lens is a negative lens having a concave surface facing the image side, at least one of the lens surfaces of the object side and the image side is an aspherical surface, the third lens is a positive meniscus lens (positive meniscus lens) having a convex surface facing the image side or a biconvex lens, at least one of the lens surfaces of the object side and the image side is an aspherical surface, the fourth lens is a negative meniscus lens or a biconcave lens having a concave surface facing the image side, the fifth lens is a lens, the fourth lens and the fifth lens are plastic lenses (plastic lenses), and a lens joint lens that joins the lens surface of the image side of the fourth lens to the object side of the fifth lens is configured,
when the refractive index of the fourth lens is n4, the refractive index n4 satisfies the following relationship
n4 > 1.6 … conditional formula (1),
when the center radius of curvature of the joint surface of the cemented lens is R45 and the effective focal length of the entire lens system is f0, the center radius of curvature R45 and the effective focal length f0 satisfy the following relationship
0.5 < | R45/f0| < 0.8 … conditional expression (2).
In the wide-angle lens of the present invention, since the refractive index n4 of the fourth lens satisfies the conditional expression (1), the total optical length can be shortened, and the curvature radius R45 of the joint surface of the joint lens and the effective focal length f0 of the entire optical system can satisfy the conditional expression (2). Therefore, magnification chromatic aberration can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface in the joint lens, the center radius of curvature is large in the image side lens surface including the concave curved surface of the fourth lens and the object side lens surface including the convex curved surface of the fifth lens. Therefore, the burden on the process is small, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed.
In the present invention, when the Abbe number (Abbe number) of the fourth lens is v4, the Abbe number v4 may satisfy the following relationship
v4 < 27 … conditional formula (3).
According to this configuration, since a material having a high refractive index n4 can be easily used for the fourth lens, chromatic aberration of magnification and the like can be easily reduced.
In the present invention, it is preferable that the combined focal length f45 satisfies the following relationship when the combined focal length of the fourth lens and the fifth lens is f45
f45/f0 < 3 … conditional expression (4).
According to the above configuration, color difference and the like can be reduced.
In the present invention, it is possible to adopt a mode in which when the focal length of the fourth lens is f4, the focal length f4 satisfies the following relationship
-2 < f4/f0 < 0 … conditional expression (5).
In the present invention, it is possible to adopt a configuration in which, when a combined focal length of the first lens and the second lens is f12 and a combined focal length of the third lens, the fourth lens, and the fifth lens is f345, a combined focal length f12 and a combined focal length f345 satisfy the following relationship
-1 < f12/f345 < 0 … conditional formula (6).
According to this structure, the total aberration can be reduced. In addition, f12/f345 is negative, so that it is advantageous for the temperature characteristics.
In the present invention, a system in which the horizontal angle of view is 120 degrees or more can be adopted.
ADVANTAGEOUS EFFECTS OF INVENTION
In the wide-angle lens of the present invention, since the refractive index n4 of the fourth lens satisfies the conditional expression (1), the total optical length can be shortened, and the curvature radius R45 of the joint surface of the joint lens and the effective focal length f0 of the entire optical system can satisfy the conditional expression (2). Therefore, magnification chromatic aberration can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface in the joint lens, the center radius of curvature is large in the image side lens surface including the concave curved surface of the fourth lens and the object side lens surface including the convex curved surface of the fifth lens. Therefore, the burden on the process is small, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed.
Drawings
Fig. 1 is an explanatory view of a wide-angle lens of embodiment 1 of the present invention.
Fig. 2 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens shown in fig. 1.
Fig. 3A to 3C are explanatory views showing astigmatism and the like of the wide-angle lens shown in fig. 1.
Fig. 4A to 4E are explanatory views showing lateral aberrations of the wide-angle lens shown in fig. 1.
Fig. 5 is an explanatory view of the wide-angle lens of embodiment 2 of the present invention.
Fig. 6 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens shown in fig. 5.
Fig. 7A to 7C are explanatory views showing astigmatism and the like of the wide-angle lens shown in fig. 5.
Fig. 8A to 8F are explanatory views showing lateral aberrations of the wide-angle lens shown in fig. 5.
Fig. 9 is an explanatory view of a wide-angle lens according to embodiment 3 of the present invention.
Fig. 10 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens shown in fig. 9.
Fig. 11A to 11C are explanatory views showing astigmatism and the like of the wide-angle lens shown in fig. 9.
Fig. 12A to 12F are explanatory views showing lateral aberrations of the wide-angle lens shown in fig. 9.
Fig. 13 is an explanatory view of a wide-angle lens according to embodiment 4 of the present invention.
Fig. 14 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens shown in fig. 13.
Fig. 15A to 15C are explanatory views showing astigmatism and the like of the wide-angle lens shown in fig. 13.
Fig. 16A to 16E are explanatory views showing lateral aberrations of the wide-angle lens shown in fig. 13.
Fig. 17 is an explanatory view of a wide-angle lens according to embodiment 5 of the present invention.
Fig. 18 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens shown in fig. 17.
Fig. 19A to 19C are explanatory views showing astigmatism and the like of the wide-angle lens shown in fig. 17.
Fig. 20A to 20F are explanatory views showing lateral aberrations of the wide-angle lens shown in fig. 17.
Description of symbols:
(1): first side
(2): second surface
(3): third side
(4): fourth surface
(5): fifth surface
(6): sixth surface
(7): seventh aspect of the invention
(8): eighth aspect of the invention
(9): ninth surface
(10): the tenth side
(11): the eleventh aspect
(12): the twelfth surface
11: first lens
12: second lens
13: third lens
14: fourth lens
15: fifth lens element
16: cemented lens
17: aperture
18: filter lens
19: imaging element
100: wide-angle lens
A4: coefficient of aspheric surface
A6: coefficient of aspheric surface
A8: coefficient of aspheric surface
A10: coefficient of aspheric surface
c: inverse of radius of curvature
f: focal length
K: coefficient of cone
r: height of light
S: characteristic of sagittal direction
T: characteristics in the meridian direction
Z: amount of sag
It is: is aspheric
Detailed Description
A wide-angle lens to which the present invention is applied will be described with reference to the accompanying drawings. In the following description, unless otherwise specified, the unit is mm.
[ example 1]
Fig. 1 is an explanatory diagram of a wide-angle lens 100 according to embodiment 1 of the present invention, and in fig. 1, surface numbers corresponding to lens data and aspherical coefficients are shown in parentheses. In addition, the surface marked with the mark behind the surface number is an aspheric surface. Fig. 2 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens 100 shown in fig. 1. Fig. 3A to 3C are explanatory diagrams showing astigmatism (astigmatism) and the like of wide-angle lens 100 shown in fig. 1, and fig. 3A, 3B, and 3C are explanatory diagrams showing astigmatism/distortion (aberration), spherical aberration (spherical aberration), and chromatic aberration of magnification. In fig. 3A, S is attached to the feature in the sagittal (sagittal) direction, and T is attached to the feature in the solar noon (tangential) direction. The distortion represents a change ratio of an image captured in the central portion and the peripheral portion, and the smaller the absolute value of the distortion, the higher the accuracy of the lens. Fig. 4A to 4E are explanatory diagrams showing lateral aberrations (lateral aberrations) of the wide-angle lens 100 shown in fig. 1, and fig. 4A, 4B, 4C, 4D, and 4E show lateral aberrations in the X-axis direction and the Y-axis direction of 0deg, 29.46deg, 55.40deg, 76.76deg, and 95.90 deg. In FIGS. 3A to 3C, aberration for light having a wavelength of 645nm is added (R), aberration for light having a wavelength of 588nm is added (G), and aberration for light having a wavelength of 486nm is added (B). The aspherical coefficient a4, aspherical coefficient a6, aspherical coefficient A8, and aspherical coefficient a10 shown in fig. 2 correspond to the respective coefficients in the following aspherical functions. Here, Z is the sag (sag) amount, c is the reciprocal of the radius of curvature, K is the conic coefficient, and r is the ray height.
[ numerical formula 1]
The horizontal field angle of the wide-angle lens 100 shown in fig. 1 is 120 degrees or more. In the wide-angle lens 100, a first lens 11, a second lens 12, a third lens 13, a stop 17, a fourth lens 14, and a fifth lens 15 are arranged in this order from the object side to the image side, and a filter 18 and an imaging element 19 are arranged in this order on the image side with respect to the fifth lens 15. The first lens 11 is a negative meniscus lens with a convex surface facing the object side. In the present embodiment, the object-side surface (first surface 1) including the convex surface of the first lens 11 is a spherical surface, and the image-side surface (second surface 2) including the concave surface is an aspherical surface.
The second lens 12 is a negative lens having a concave surface facing the image side. In the present embodiment, the second lens 12 is a negative meniscus lens with a concave surface facing the image side, and at least one of the object-side lens surface (the third surface 3) including the convex surface and the image-side lens surface (the fourth surface 4) including the concave surface is an aspheric surface. In the present embodiment, the object-side surface (third surface 3) and the image-side surface (fourth surface 4) of the second lens 12 are both aspheric.
The third lens 13 is a positive meniscus lens or a biconvex lens with a convex surface facing the image side, and at least one of a lens surface on the object side (fifth surface 5) and a lens surface on the image side (sixth surface 6) is an aspherical surface. In the present embodiment, the third lens 13 is a biconvex lens, and both an object-side surface (fifth surface 5) including a convex surface and an image-side surface (sixth surface 6) including a convex surface are aspheric.
The fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, or a biconcave lens. In the present embodiment, the fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, and both the object-side surface (eighth surface 8) including the convex surface and the image-side surface (ninth surface 9) including the concave surface of the fourth lens 14 are aspheric.
The fifth lens 15 is a biconvex lens. The fourth lens 14 and the fifth lens 15 are plastic lenses, and constitute a cemented lens 16 in which a lens surface on the image side of the fourth lens 14 and a lens surface on the object side of the fifth lens 15 are cemented. The cemented surface (ninth surface 9) of the cemented lens 16 and the image-side surface (tenth surface 10) including the convex surface of the fifth lens element 15 are both aspheric. In the present embodiment, the first lens 11, the second lens 12, and the third lens 13 are also plastic lenses, as are the fourth lens 14 and the fifth lens 15.
The main parameters of the wide-angle lens 100 configured as described above are shown in table 1. The parameters shown in table 1 are as follows. Table 1 also shows parameters of examples 2 to 5 described later.
f 0-effective focal length of the lens system as a whole
f4 DEG focal length of fourth lens 14
f 345. the combined focal length of the third lens 13, the fourth lens 14 and the fifth lens 15
R45. radius of curvature of center of bonding surface of bonding lens 16
n4 DEG refractive index of fourth lens 14
[ Table 1]
| Examples | f0 | f4 | f12 | f345 | f45 | R45 | n4 | v4 | f4/f0 | f45/f0 | f12/f345 | |R45/f0| |
| 1 | 0.822 | -1.454 | -0.889 | 2.182 | 2.314 | 0.515 | 1.632 | 23.3 | -1.769 | 2.816 | -0.408 | 0.627 |
| 2 | 1.410 | -2.787 | -1.662 | 2.648 | 3.057 | 0.750 | 1.632 | 23.3 | -1.976 | 2.168 | -0.628 | 0.532 |
| 3 | 1.410 | -2.249 | -1.807 | 2.671 | 3.205 | 0.764 | 1.632 | 23.3 | -1.595 | 2.272 | -0.676 | 0.542 |
| 4 | 1.056 | -1.528 | -1.711 | 2.088 | 3.055 | 0.615 | 1.637 | 24.0 | -1.447 | 2.894 | -0.819 | 0.582 |
| 5 | 0.669 | -1.062 | -1.428 | 2.372 | 1.884 | 0.472 | 1.637 | 24.0 | -1.587 | 2.815 | -0.602 | 0.705 |
| Conditional formula (II) | ＞1.6 | ＜27 | -2～0 | ＜3 | -1～0 | 0.5～0.8 | ||||||
| Condition | (1) | (3) | (5) | (4) | (6) | (2) |
As shown in fig. 2, the Effective Focal Length F0(Effective Focal Length) of the entire optical system of the wide-Angle lens 100 is 0.822mm, the inter-object distance (Total Track Length)/Total optical Length) is 9.206mm, the F value (Image Space F/#) of the entire lens system is 2.4, the maximum Field Angle (max. Field Angle) is 192deg, and the Horizontal Field Angle (Horizontal Field Angle) is 192 deg.
As shown in fig. 2 and table 1, the wide-angle lens 100 satisfies all of the following conditional expressions (1), (2), (3), (4), (5), and (6). First, the refractive index n4 of the fourth lens 14 is 1.632, and the following conditional expression (1) is satisfied.
n4 > 1.6 … conditional formula (1)
The center radius of curvature R45 of the joint surface (ninth surface 9) of the joint lens 16 is 0.515mm, and the effective focal length f0 of the entire lens system is 0.822 mm. Therefore, the following conditional expression (2) is satisfied.
0.5 < | R45/f0| -0.627 < 0.8 … conditional expression (2)
The abbe number v4 of the fourth lens 14 is 23.3, and satisfies the following conditional expression (3).
v4 < 27 … conditional expression (3)
As a material used for the fourth lens 14, for example, an optical polyester resin (OKP4HT) manufactured by osaka gas chemical corporation, and the like can be exemplified.
The combined focal length f45 of the fourth lens 14 and the fifth lens 15 is 2.314mm, and the effective focal length f0 of the entire lens system is 0.822 mm. Therefore, the following conditional expression (4) is satisfied.
Conditional expression (4) of f45/f0 ═ 2.816 < 3 …
The focal length f4 of the fourth lens 14 is-1.454 mm, and the effective focal length f0 of the entire lens system is 0.822 mm. Therefore, the focal length f4 satisfies the following conditional expression (5).
-2 < f4/f0 ═ 1.769 < 0 … conditional formula (5)
The combined focal length f12 of the first lens 11 and the second lens 12 is-0.889 mm, and the combined focal length f345 of the third lens 13, the fourth lens 14 and the fifth lens 15 is 2.182 mm. Therefore, the combined focal length f12 and the combined focal length f345 satisfy the following conditional expression (6).
-1 < f12/f345 ═ -0.408 < 0 … conditional expression (6)
Astigmatism/distortion (spherical aberration), and chromatic aberration of magnification of the wide-angle lens 100 configured as described above are as shown in fig. 3A to 3C, and lateral aberrations are small as shown in fig. 4A to 4E.
(main effect of the present embodiment)
As described above, the wide-angle lens 100 of the present embodiment has a lens structure of four groups of five lenses, and each of the 5 lenses is composed of a plastic lens. Therefore, even if the horizontal angle of view is 120 ° or more, the wide-angle lens 100 can be made compact and lightweight and at low cost. In addition, since 8 out of 9 surfaces in total are aspherical surfaces, aberration can be reduced by a small number of pieces as shown in fig. 3A to 3C.
In the wide-angle lens 100 according to the present embodiment, the refractive index n4 of the fourth lens 14 satisfies the conditional expression (1), and the refractive index n4 is greater than 1.6. Therefore, the total optical length of the wide-angle lens 100 can be shortened, and the curvature radius R45 of the joint surface (ninth surface 9) of the joint lens 16 and the effective focal length f0 of the entire optical system easily satisfy the conditional expression (2). Therefore, magnification chromatic aberration can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface (ninth surface 9) in the joint lens 16, the center radius of curvature of the lens surface on the image side including the concave curved surface of the fourth lens 14 and the lens surface on the object side including the convex curved surface of the fifth lens 15 is large. Therefore, the burden on the process is small, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed. The abbe number v4 of the fourth lens 14 satisfies the conditional expression (3), and the abbe number v4 is smaller than 27. Therefore, since a material having a high refractive index n4 can be easily used for the fourth lens 14, chromatic aberration of magnification and the like can be reduced.
The combined focal length f45 of the fourth lens element 14 and the fifth lens element 15 is short, and satisfies the conditional expression (4). Therefore, reduction in color difference and the like can be achieved. Further, the focal length f4 of the fourth lens 14 is short, and the conditional expression (5) is satisfied. Therefore, reduction of chromatic aberration is facilitated. Further, the combined focal length f12 of the first lens 11 and the second lens 12 and the combined focal length f345 of the third lens 13, the fourth lens 14, and the fifth lens 15 satisfy the conditional expression (6), and the polarity of the combined focal length f12 of the first lens 11 and the second lens 12 is negative. Therefore, it is advantageous for the temperature characteristics.
[ example 2]
Fig. 5 is an explanatory diagram of the wide-angle lens 100 according to embodiment 2 of the present invention. Fig. 6 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens 100 shown in fig. 5. Fig. 7A to 7C are explanatory diagrams showing aberrations of the wide-angle lens 100 shown in fig. 5. Fig. 8A to 8F are explanatory diagrams showing lateral aberrations of the wide-angle lens 100 shown in fig. 5. Since the basic configuration of the present embodiment is the same as that of embodiment 1, the same reference numerals are attached to the common portions to illustrate the common portions, and detailed descriptions of the common portions are omitted.
In the wide-angle lens 100 shown in fig. 5, the horizontal field angle is 120 degrees or more, and the first lens 11, the second lens 12, the third lens 13, the stop 17, the fourth lens 14, and the fifth lens 15 are arranged in this order from the object side to the image side, as in embodiment 1. The first lens 11 is a negative meniscus lens with a convex surface facing the object side. In the present embodiment, the object-side surface (first surface 1) including the convex surface of the first lens 11 is a spherical surface, and the image-side surface (second surface 2) including the concave surface is an aspherical surface.
The second lens 12 is a negative lens having a concave surface facing the image side. In the present embodiment, the second lens 12 is a negative meniscus lens with a concave surface facing the image side, and at least one of the object-side lens surface (the third surface 3) including the convex surface and the image-side lens surface (the fourth surface 4) including the concave surface is an aspheric surface. In the present embodiment, the object-side surface (third surface 3) and the image-side surface (fourth surface 4) of the second lens 12 are both aspheric.
The third lens 13 is a positive meniscus lens or a biconvex lens with a convex surface facing the image side, and at least one of a lens surface on the object side (fifth surface 5) and a lens surface on the image side (sixth surface 6) is an aspherical surface. In the present embodiment, the third lens 13 is a positive meniscus lens with a convex surface facing the image side, and both the object-side surface (fifth surface 5) including the concave surface and the image-side surface (sixth surface 6) including the convex surface are aspheric.
The fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, or a biconcave lens. In the present embodiment, the fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, and both the object-side surface (eighth surface 8) including the convex surface and the image-side surface (ninth surface 9) including the concave surface of the fourth lens 14 are aspheric.
The fifth lens 15 is a biconvex lens. The fourth lens 14 and the fifth lens 15 are plastic lenses, and constitute a cemented lens 16 in which a lens surface on the image side of the fourth lens 14 and a lens surface on the object side of the fifth lens 15 are cemented. The cemented surface (ninth surface 9) of the cemented lens 16 and the image-side surface (tenth surface 10) including the convex surface of the fifth lens element 15 are both aspheric. In the present embodiment, the first lens 11, the second lens 12, and the third lens 13 are also plastic lenses, as are the fourth lens 14 and the fifth lens 15.
In the wide-angle lens 100 configured as described above, the effective focal length F0 of the entire optical system is 1.410mm, the inter-object distance is 11.378mm, the F value of the entire lens system is 2.0, the maximum angle of view is 156deg, and the horizontal angle of view is 130 deg.
As shown in fig. 6 and table 1, the wide-angle lens 100 satisfies all of the conditional expressions (1), (2), (3), (4), (5), and (6). First, the refractive index n4 of the fourth lens 14 is 1.632, and satisfies the conditional expression (1). The central radius of curvature R45 of the joint surface (ninth surface 9) of the joint lens 16 is 0.750mm, and the effective focal length f0 of the entire lens system is 1.410. Therefore, | R45/f0| is 0.532, and conditional expression (2) is satisfied. The abbe number v4 of the fourth lens 14 is 23.3, and satisfies conditional expression (3).
Since the combined focal length f45 of the fourth lens element 14 and the fifth lens element 15 is 3.057mm and the effective focal length f0 of the entire lens system is 1.410mm, f45/f0 is 2.168, and the conditional expression (4) is satisfied. Since the focal length f4 of the fourth lens element 14 is-2.787 mm and the effective focal length f0 of the entire lens system is 1.410mm, f4/f0 is-1.976, and conditional expression (5) is satisfied. The combined focal length f12 of the first lens 11 and the second lens 12 is-1.662 mm, and the combined focal length f345 of the third lens 13, the fourth lens 14 and the fifth lens 15 is 2.648 mm. Therefore, f12/f345 is-0.628, and conditional expression (6) is satisfied.
Astigmatism/distortion (spherical aberration), and chromatic aberration of magnification of the wide-angle lens 100 configured as described above are as shown in fig. 7A to 7C, and lateral aberrations are small as shown in fig. 8A to 8F.
As described above, the wide-angle lens 100 of the present embodiment has a lens structure of four groups of five lenses, and each of the 5 lenses is composed of a plastic lens. Therefore, even if the horizontal angle of view is 120 ° or more, the wide-angle lens 100 can be made compact and lightweight and at low cost. In addition, since 8 out of 9 surfaces in total are aspherical surfaces, aberrations can be reduced with a small number of pieces as shown in fig. 7A to 7C.
In the wide-angle lens 100 of the present embodiment, since the curvature radius R45 of the joint surface (ninth surface 9) of the joint lens 16 and the effective focal length f0 of the entire optical system satisfy the conditional expression (2), chromatic aberration of magnification can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface (ninth surface 9) in the joint lens 16, the center radius of curvature of the lens surface on the image side including the concave curved surface of the fourth lens 14 and the lens surface on the object side including the convex curved surface of the fifth lens 15 is large. Therefore, the same effect as in example 1 is produced, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed.
[ example 3]
Fig. 9 is an explanatory diagram of the wide-angle lens 100 according to embodiment 3 of the present invention. Fig. 10 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens 100 shown in fig. 9. Fig. 11A to 11C are explanatory diagrams illustrating aberrations of the wide-angle lens 100 shown in fig. 9. Fig. 12A to 12F are explanatory diagrams showing lateral aberrations of the wide-angle lens 100 shown in fig. 9. Since the basic configuration of the present embodiment is the same as that of embodiment 1, the same reference numerals are attached to the common portions to illustrate the common portions, and detailed descriptions of the common portions are omitted.
In the wide-angle lens 100 shown in fig. 9, the horizontal angle of view is 120 degrees or more, and the first lens 11, the second lens 12, the third lens 13, the stop 17, the fourth lens 14, and the fifth lens 15 are arranged in this order from the object side to the image side, as in embodiment 1. The first lens 11 is a negative meniscus lens with a convex surface facing the object side. In the present embodiment, the object-side surface (first surface 1) including the convex surface and the image-side surface (second surface 2) including the concave surface of the first lens 11 are both spherical surfaces.
The second lens 12 is a negative lens having a concave surface facing the image side. In the present embodiment, the second lens 12 is a negative meniscus lens with a concave surface facing the image side, and at least one of the object-side lens surface (the third surface 3) including the convex surface and the image-side lens surface (the fourth surface 4) including the concave surface is an aspheric surface. In the present embodiment, the object-side surface (third surface 3) and the image-side surface (fourth surface 4) of the second lens 12 are both aspheric.
The third lens 13 is a positive meniscus lens or a biconvex lens with a convex surface facing the image side, and at least one of a lens surface on the object side (fifth surface 5) and a lens surface on the image side (sixth surface 6) is an aspherical surface. In the present embodiment, the third lens 13 is a positive meniscus lens with a convex surface facing the image side, and both the object-side surface (fifth surface 5) including the concave surface and the image-side surface (sixth surface 6) including the convex surface are aspheric.
The fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, or a biconcave lens. In the present embodiment, the fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, and both the object-side surface (eighth surface 8) including the convex surface and the image-side surface (ninth surface 9) including the concave surface of the fourth lens 14 are aspheric.
The fifth lens 15 is a biconvex lens. The fourth lens 14 and the fifth lens 15 are plastic lenses, and constitute a cemented lens 16 in which a lens surface on the image side of the fourth lens 14 and a lens surface on the object side of the fifth lens 15 are cemented. The cemented surface (ninth surface 9) of the cemented lens 16 and the image-side surface (tenth surface 10) including the convex surface of the fifth lens element 15 are both aspheric. In the present embodiment, the first lens 11 is a glass lens, and the second lens 12 and the third lens 13 are plastic lenses as well as the fourth lens 14 and the fifth lens 15.
In the wide-angle lens 100 configured as described above, the effective focal length F0 of the entire optical system is 1.410mm, the inter-object distance is 11.465mm, the F value of the entire lens system is 2.0, the maximum angle of view is 156deg, and the horizontal angle of view is 131 deg.
As shown in fig. 10 and table 1, the wide-angle lens 100 satisfies all of the conditional expressions (1), (2), (3), (4), (5), and (6). First, the refractive index n4 of the fourth lens 14 is 1.632, and satisfies the conditional expression (1). The center radius of curvature R45 of the joint surface (ninth surface 9) of the joint lens 16 is 0.764mm, and the effective focal length f0 of the entire lens system is 1.410. Therefore, | R45/f0| is 0.542, and conditional expression (2) is satisfied. The abbe number v4 of the fourth lens 14 is 23.3, and satisfies conditional expression (3).
Since the combined focal length f45 of the fourth lens element 14 and the fifth lens element 15 is 3.205mm and the effective focal length f0 of the entire lens system is 1.410mm, f45/f0 is 2.272, and conditional expression (4) is satisfied. Since the focal length f4 of the fourth lens element 14 is-2.249 mm and the effective focal length f0 of the entire lens system is 1.410mm, f4/f0 is-1.595, and conditional expression (5) is satisfied. The combined focal length f12 of the first lens 11 and the second lens 12 is-1.807 mm, and the combined focal length f345 of the third lens 13, the fourth lens 14 and the fifth lens 15 is 2.671 mm. Therefore, f12/f345 is-0.676, and conditional expression (6) is satisfied.
Astigmatism/distortion (spherical aberration), and chromatic aberration of magnification of the wide-angle lens 100 configured as described above are as shown in fig. 11A to 11C, and lateral aberrations are small as shown in fig. 12A to 12F.
As described above, the wide-angle lens 100 of the present embodiment has a lens structure of four groups of five lenses, and 4 lenses are formed of plastic lenses. Therefore, even if the horizontal angle of view is 120 ° or more, the wide-angle lens 100 can be made compact and lightweight and at low cost. In addition, since 7 surfaces out of 9 surfaces in total are aspherical surfaces, aberrations can be reduced with a small number of sheets as shown in fig. 11A to 11C.
In the wide-angle lens 100 of the present embodiment, since the curvature radius R45 of the joint surface (ninth surface 9) of the joint lens 16 and the effective focal length f0 of the entire optical system satisfy the conditional expression (2), chromatic aberration of magnification can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface (ninth surface 9) in the joint lens 16, the center radius of curvature of the lens surface on the image side including the concave curved surface of the fourth lens 14 and the lens surface on the object side including the convex curved surface of the fifth lens 15 is large. Therefore, the same effect as in example 1 is produced, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed.
[ example 4]
Fig. 13 is an explanatory diagram of the wide-angle lens 100 according to embodiment 4 of the present invention. Fig. 14 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens 100 shown in fig. 13. Fig. 15A to 15C are explanatory diagrams illustrating aberrations of the wide-angle lens 100 shown in fig. 13. Fig. 16A to 16E are explanatory views showing lateral aberrations of the wide-angle lens 100 shown in fig. 13. Since the basic configuration of the present embodiment is the same as that of embodiment 1, the same reference numerals are attached to the common portions to illustrate the common portions, and detailed descriptions of the common portions are omitted.
In the wide-angle lens 100 shown in fig. 13, the horizontal angle of view is 120 degrees or more, and the first lens 11, the second lens 12, the third lens 13, the stop 17, the fourth lens 14, and the fifth lens 15 are arranged in this order from the object side to the image side, as in embodiment 1. The first lens 11 is a negative meniscus lens with a convex surface facing the object side. In the present embodiment, the object-side surface (first surface 1) including the convex surface and the image-side surface (second surface 2) including the concave surface of the first lens 11 are both spherical surfaces.
The second lens 12 is a negative lens having a concave surface facing the image side. In the present embodiment, the second lens 12 is a negative meniscus lens with a concave surface facing the image side, and at least one of the object-side lens surface (the third surface 3) including the convex surface and the image-side lens surface (the fourth surface 4) including the concave surface is an aspheric surface. In the present embodiment, the object-side surface (third surface 3) and the image-side surface (fourth surface 4) of the second lens 12 are both aspheric.
The third lens 13 is a positive meniscus lens or a biconvex lens with a convex surface facing the image side, and at least one of a lens surface on the object side (fifth surface 5) and a lens surface on the image side (sixth surface 6) is an aspherical surface. In the present embodiment, the third lens 13 is a positive meniscus lens with a convex surface facing the image side, and both the object-side surface (fifth surface 5) including the concave surface and the image-side surface (sixth surface 6) including the convex surface are aspheric.
The fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, or a biconcave lens. In the present embodiment, the fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, and both the object-side surface (eighth surface 8) including the convex surface and the image-side surface (ninth surface 9) including the concave surface of the fourth lens 14 are aspheric.
The fifth lens 15 is a biconvex lens. The fourth lens 14 and the fifth lens 15 are plastic lenses, and constitute a cemented lens 16 in which a lens surface on the image side of the fourth lens 14 and a lens surface on the object side of the fifth lens 15 are cemented. The cemented surface (ninth surface 9) of the cemented lens 16 and the image-side surface (tenth surface 10) including the convex surface of the fifth lens element 15 are both aspheric. In the present embodiment, the first lens 11 is a glass lens, and the second lens 12 and the third lens 13 are plastic lenses as well as the fourth lens 14 and the fifth lens 15.
In the wide-angle lens 100 configured as described above, the effective focal length F0 of the entire optical system is 1.056mm, the inter-object distance is 11.794mm, the F value of the entire lens system is 2.0, the maximum field angle is 193deg, and the horizontal field angle is 193 deg.
As shown in fig. 14 and table 1, the wide-angle lens 100 satisfies all of the conditional expressions (1), (2), (3), (4), (5), and (6). First, the refractive index n4 of the fourth lens 14 is 1.637, and satisfies the conditional expression (1). The center radius of curvature R45 of the joint surface (ninth surface 9) of the joint lens 16 is 0.615mm, and the effective focal length f0 of the entire lens system is 1.056. Therefore, | R45/f0| is 0.582, and conditional expression (2) is satisfied. The abbe number v4 of the fourth lens 14 is 24.0, and satisfies the conditional expression (3).
Since the combined focal length f45 of the fourth lens element 14 and the fifth lens element 15 is 3.055mm and the effective focal length f0 of the entire lens system is 1.056mm, f45/f0 is 2.894, and conditional expression (4) is satisfied. The focal length f4 of the fourth lens element 14 is-1.528 mm, the effective focal length f0 of the entire lens system is 1.056mm, and f4/f0 is-1.447, and the conditional expression (5) is satisfied. The combined focal length f12 of the first lens 11 and the second lens 12 is-1.711 mm, and the combined focal length f345 of the third lens 13, the fourth lens 14 and the fifth lens 15 is 2.088 mm. Therefore, f12/f345 is-0.819, and conditional expression (6) is satisfied.
Astigmatism/distortion (spherical aberration), and chromatic aberration of magnification of the wide-angle lens 100 configured as described above are as shown in fig. 15A to 15C, and lateral aberrations are small as shown in fig. 16A to 16E.
As described above, the wide-angle lens 100 of the present embodiment has a lens structure of four groups of five lenses, and 4 lenses are formed of plastic lenses. Therefore, even if the horizontal angle of view is 120 ° or more, the wide-angle lens 100 can be made compact and lightweight and at low cost. Further, since 7 surfaces out of the total of nine surfaces are aspherical surfaces, aberrations can be reduced with a small number of sheets as shown in fig. 15A to 15C.
In the wide-angle lens 100 of the present embodiment, since the curvature radius R45 of the joint surface (ninth surface 9) of the joint lens 16 and the effective focal length f0 of the entire optical system satisfy the conditional expression (2), chromatic aberration of magnification can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface (ninth surface 9) in the joint lens 16, the center radius of curvature of the lens surface on the image side including the concave curved surface of the fourth lens 14 and the lens surface on the object side including the convex curved surface of the fifth lens 15 is large. Therefore, the same effect as in example 1 is produced, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed.
[ example 5]
Fig. 17 is an explanatory diagram of the wide-angle lens 100 according to embodiment 5 of the present invention. Fig. 18 is an explanatory diagram showing lens data, aspherical coefficients, and the like of the wide-angle lens 100 shown in fig. 17. Fig. 19A to 19C are explanatory diagrams showing aberrations of the wide-angle lens 100 shown in fig. 17. Fig. 20A to 20F are explanatory views showing lateral aberrations of the wide-angle lens 100 shown in fig. 17. Since the basic configuration of the present embodiment is the same as that of embodiment 1, the same reference numerals are attached to the common portions to illustrate the common portions, and detailed descriptions of the common portions are omitted.
In the wide-angle lens 100 shown in fig. 17, the horizontal angle of view is 120 degrees or more, and the first lens 11, the second lens 12, the third lens 13, the stop 17, the fourth lens 14, and the fifth lens 15 are arranged in this order from the object side to the image side, as in embodiment 1. The first lens 11 is a negative meniscus lens with a convex surface facing the object side. In the present embodiment, the object-side surface (first surface 1) including the convex surface and the image-side surface (second surface 2) including the concave surface of the first lens 11 are both spherical surfaces.
The second lens 12 is a negative lens having a concave surface facing the image side. In the present embodiment, the second lens 12 is a biconcave lens, and at least one of the object-side lens surface (third surface 3) including a concave surface and the image-side lens surface (fourth surface 4) including a concave surface is an aspheric surface. In the present embodiment, the object-side surface (third surface 3) and the image-side surface (fourth surface 4) of the second lens 12 are both aspheric.
The third lens 13 is a positive meniscus lens or a biconvex lens with a convex surface facing the image side, and at least one of a lens surface on the object side (fifth surface 5) and a lens surface on the image side (sixth surface 6) is an aspherical surface. In the present embodiment, the third lens 13 is a positive meniscus lens with a convex surface facing the image side, and both the object-side surface (fifth surface 5) including the concave surface and the image-side surface (sixth surface 6) including the convex surface are aspheric.
The fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, or a biconcave lens. In the present embodiment, the fourth lens 14 is a negative meniscus lens with a concave surface facing the image side, and both the object-side surface (eighth surface 8) including the convex surface and the image-side surface (ninth surface 9) including the concave surface of the fourth lens 14 are aspheric.
The fifth lens 15 is a biconvex lens. The fourth lens 14 and the fifth lens 15 are plastic lenses, and constitute a cemented lens 16 in which a lens surface on the image side of the fourth lens 14 and a lens surface on the object side of the fifth lens 15 are cemented. The cemented surface (ninth surface 9) of the cemented lens 16 and the image-side surface (tenth surface 10) including the convex surface of the fifth lens element 15 are both aspheric.
In the present embodiment, the first lens 11 is a glass lens, and the second lens 12 and the third lens 13 are plastic lenses as well as the fourth lens 14 and the fifth lens 15.
In the wide-angle lens 100 configured as described above, the effective focal length F0 of the entire optical system is 0.669mm, the inter-object distance is 11.702mm, the F value of the entire lens system is 2.0, the maximum angle of view is 196deg, and the horizontal angle of view is 161 deg.
As shown in fig. 18 and table 1, the wide-angle lens 100 satisfies all of the conditional expressions (1), (2), (3), (4), (5), and (6). First, the refractive index n4 of the fourth lens 14 is 1.637, and satisfies the conditional expression (1). The center radius of curvature R45 of the joint surface (ninth surface 9) of the joint lens 16 is 0.472mm, and the effective focal length f0 of the entire lens system is 0.669. Therefore, | R45/f0| is 0.705, and conditional expression (2) is satisfied. The abbe number v4 of the fourth lens 14 is 24.0, and satisfies the conditional expression (3).
Since the combined focal length f45 of the fourth lens element 14 and the fifth lens element 15 is 1.884mm and the effective focal length f0 of the entire lens system is 0.669mm, f45/f0 is 2.815, and conditional expression (4) is satisfied. Since the focal length f4 of the fourth lens element 14 is-1.062 mm and the effective focal length f0 of the entire lens system is 0.669mm, f4/f0 is-1.587, and conditional expression (5) is satisfied. The combined focal length f12 of the first lens 11 and the second lens 12 is-1.428 mm, and the combined focal length f345 of the third lens 13, the fourth lens 14 and the fifth lens 15 is 2.372 mm. Therefore, f12/f345 is-0.602, and conditional expression (6) is satisfied.
Astigmatism/distortion (spherical aberration), and chromatic aberration of magnification of the wide-angle lens 100 configured as described above are as shown in fig. 19A to 19C, and lateral aberrations are small as shown in fig. 20A to 20F.
As described above, the wide-angle lens 100 of the present embodiment has a lens structure of four groups of five lenses, and 4 lenses are formed of plastic lenses. Therefore, even if the horizontal angle of view is 120 ° or more, the wide-angle lens 100 can be made compact and lightweight and at low cost. In addition, since 7 surfaces out of 9 surfaces in total are aspherical surfaces, aberration can be reduced by a small number of pieces as shown in fig. 19A to 19C.
In the wide-angle lens 100 of the present embodiment, since the curvature radius R45 of the joint surface (ninth surface 9) of the joint lens 16 and the effective focal length f0 of the entire optical system satisfy the conditional expression (2), chromatic aberration of magnification can be reduced. Further, since the lower limit is set on the radius of curvature R45 of the joint surface (ninth surface 9) in the joint lens 16, the center radius of curvature of the lens surface on the image side including the concave curved surface of the fourth lens 14 and the lens surface on the object side including the convex curved surface of the fifth lens 15 is large. Therefore, the same effect as in example 1 is produced, and for example, the process of manufacturing the lens unit and the bonding process can be stably performed.
Claims (5)
1. A wide-angle lens, characterized in that:
the wide-angle lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens and a fifth lens which are arranged in sequence from the object side to the image side,
the first lens is a negative meniscus lens with a convex surface facing the object side and a concave surface facing the image side,
the second lens is a negative lens with a concave surface facing the image side, at least one of the lens surface of the object side and the lens surface of the image side is an aspheric surface,
the third lens is a positive meniscus lens having a concave surface facing the object side and a convex surface facing the image side, at least one of the object side lens surface and the image side lens surface is an aspherical surface,
the fourth lens is a negative meniscus lens with a concave surface facing the image side,
the fifth lens is a double-convex lens,
the fourth lens and the fifth lens are plastic lenses and constitute a cemented lens in which a lens surface on the image side of the fourth lens and a lens surface on the object side of the fifth lens are cemented together,
when the refractive index of the fourth lens is n4, the refractive index n4 satisfies the following relationship
n4≥1.632，
When the center radius of curvature of the joint surface of the cemented lens is R45 and the effective focal length of the entire lens system is f0, the center radius of curvature R45 and the effective focal length f0 satisfy the following relationship
0.532＜|R45/f0|＜0.8，
When the abbe number of the fourth lens is v4, the abbe number v4 satisfies the following relationship
ν4≤24。
2. The wide-angle lens of claim 1, wherein:
when a combined focal length of the fourth lens and the fifth lens is set to f45, a combined focal length f45 satisfies the following relationship f45/f0 < 3.
3. The wide-angle lens of claim 1, wherein:
when the focal length of the fourth lens is set to f4, the focal length f4 satisfies the following relationship
-2＜f4/f0＜0。
4. The wide-angle lens of claim 1, wherein:
when a combined focal length of the first lens and the second lens is f12 and a combined focal length of the third lens, the fourth lens, and the fifth lens is f345, a combined focal length f12 and a combined focal length f345 satisfy the following relationship
-1＜f12/f345＜0。
5. The wide-angle lens of claim 1, wherein:
the horizontal field angle of the wide-angle lens is more than 120 degrees.
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| JP2016070437A JP6824618B2 (en) | 2016-03-31 | 2016-03-31 | Wide-angle lens |
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| JP2019028201A (en) * | 2017-07-28 | 2019-02-21 | 日本電産サンキョー株式会社 | Wide angle lens |
| JP7166289B2 (en) * | 2017-12-26 | 2022-11-07 | 日本電産サンキョー株式会社 | wide angle lens |
| JP7029974B2 (en) | 2018-02-19 | 2022-03-04 | 日本電産サンキョー株式会社 | Wide-angle lens |
| JP7387312B2 (en) * | 2018-10-01 | 2023-11-28 | キヤノン株式会社 | Optical system and imaging device including it |
| CN109975960B (en) * | 2019-04-25 | 2024-05-31 | 协益电子（苏州）有限公司 | Around wide-angle athermalized lens and automobile panoramic around system |
| TWI783541B (en) * | 2021-06-22 | 2022-11-11 | 佳凌科技股份有限公司 | Optical Imaging Lens |
| CN114815151A (en) * | 2022-04-18 | 2022-07-29 | 惠州星聚宇智能科技有限公司 | Stable optical lens of formation of image |
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| WO2015072094A1 (en) * | 2013-11-12 | 2015-05-21 | パナソニックＩｐマネジメント株式会社 | Single-focus lens system, camera and automobile |
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| JP4866630B2 (en) * | 2006-03-02 | 2012-02-01 | アルプス電気株式会社 | Optical device |
| JP5064154B2 (en) * | 2007-09-07 | 2012-10-31 | 日本電産ニッシン株式会社 | Super wide angle lens |
| JP2010243711A (en) * | 2009-04-03 | 2010-10-28 | Ricoh Co Ltd | Wide-angle lens and imaging apparatus |
| US8107175B2 (en) * | 2009-10-02 | 2012-01-31 | Nikon Corporation | Wide-angle lens, optical apparatus, and method for manufacturing wide-angle lens |
| KR101932717B1 (en) * | 2012-02-13 | 2018-12-26 | 삼성전자주식회사 | Imaging lens system |
| JP5893468B2 (en) * | 2012-03-29 | 2016-03-23 | 日立マクセル株式会社 | Imaging lens and imaging apparatus |
| JP6125796B2 (en) * | 2012-10-30 | 2017-05-10 | 日本電産サンキョー株式会社 | Wide-angle lens and wide-angle lens unit |
| JP2014228570A (en) * | 2013-05-20 | 2014-12-08 | 富士フイルム株式会社 | Wide-angle imaging lens and imaging device |
| JP2015034922A (en) * | 2013-08-09 | 2015-02-19 | 日本電産サンキョー株式会社 | Wide-angle lens |
| JP5607223B1 (en) * | 2013-08-29 | 2014-10-15 | サーテック インターナショナル （スツォウ） カンパニー リミテッド | Wide angle lens |
| TWI484211B (en) * | 2013-12-18 | 2015-05-11 | 玉晶光電股份有限公司 | Camera device and optical imaging lens thereof |
| JP6274225B2 (en) * | 2014-01-20 | 2018-02-07 | パナソニックＩｐマネジメント株式会社 | Single focus lens system, camera and automobile |
| JP6225040B2 (en) * | 2014-01-31 | 2017-11-01 | Hoya株式会社 | Wide angle lens |
| JP6145887B2 (en) * | 2014-03-12 | 2017-06-14 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| JP6066424B2 (en) * | 2014-03-12 | 2017-01-25 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
| CN105137567B (en) * | 2015-08-12 | 2017-09-12 | 北京天诚盛业科技有限公司 | Imaging lens, iris imaging module and iris identification device |
| TWI657284B (en) * | 2017-07-21 | 2019-04-21 | 先進光電科技股份有限公司 | Optical image capturing system |
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| TWI728083B (en) | 2021-05-21 |
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| CN107272163A (en) | 2017-10-20 |
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